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Heat and Mass Transfer

Heat and Mass Transfer
The unit of overall coefficient of heat transfer is

kcal/m² hr °C
kcal/m²
kcal/hr °C
kcal/m hr °C

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Heat and Mass Transfer
The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as

Intensity of radiation
Emissivity
Reflectivity
Transmissivity

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Heat and Mass Transfer
Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take place mainly by

Radiation
Forced convection
Convection
Free convection

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Heat and Mass Transfer
In heat exchangers, degree of approach is defined as the difference between temperatures of

Cold water inlet and outlet
Hot medium outlet and cold water outlet
Hot medium inlet and outlet
Hot medium outlet and cold water inlet

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Heat and Mass Transfer
A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100°C and leaves at 60°C. A cold fluid enters the heat exchanger at 40°C. The mean temperature difference between the two fluids is

66.7°C
60°C
40°C
20°C

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Heat and Mass Transfer
The heat of sun reaches to us according to

Conduction
Radiation
Convection
None of these

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